A simple pendulum with a bob of mass \( m \) is suspended from the roof of a car moving with hor...

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A simple pendulum with a bob of mass \( m \) is suspended from the roof of a car moving with horizontal acceleration \( a \)
(a) The string makes an angle of \( \tan ^{-1}(a / g) \) with the vertical
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(b) The string makes an angle of \( \sin ^{-1}\left(\frac{a}{g}\right) \) with the vertical
W
(c) The tension in the string is \( m \sqrt{a^{2}+g^{2}} \)
(d) The tension in the string is \( m \sqrt{g^{2}-a^{2}} \)
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